Comparison of 2014 estimate ($566.0 million) and 2015 request ($620.1 million): The $54.1 million increase is
primarily due to a $22.4 million increase in DOE/SC funding in HEC I&A for preparations for the next upgrades at
the DOE’s Leadership Computing Facilities and $23.8 million in HEC R&D for exascale and data-intensive science-related research, with small increases and decreases in other PCAs.